{"id":18325,"url":"https://patchwork.libcamera.org/api/patches/18325/?format=json","web_url":"https://patchwork.libcamera.org/patch/18325/","project":{"id":1,"url":"https://patchwork.libcamera.org/api/projects/1/?format=json","name":"libcamera","link_name":"libcamera","list_id":"libcamera_core","list_email":"libcamera-devel@lists.libcamera.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20230302081349.3334290-3-chenghaoyang@google.com>","date":"2023-03-02T08:13:48","name":"[libcamera-devel,v3,2/3] libcamera: Add UdmaHeap if DmaHeap is not valid","commit_ref":null,"pull_url":null,"state":"superseded","archived":false,"hash":"b75e3799a9972185a8b40141cb6770fc325fb44d","submitter":{"id":117,"url":"https://patchwork.libcamera.org/api/people/117/?format=json","name":"Cheng-Hao Yang","email":"chenghaoyang@chromium.org"},"delegate":null,"mbox":"https://patchwork.libcamera.org/patch/18325/mbox/","series":[{"id":3780,"url":"https://patchwork.libcamera.org/api/series/3780/?format=json","web_url":"https://patchwork.libcamera.org/project/libcamera/list/?series=3780","date":"2023-03-02T08:13:46","name":"Add HeapAllocator","version":3,"mbox":"https://patchwork.libcamera.org/series/3780/mbox/"}],"comments":"https://patchwork.libcamera.org/api/patches/18325/comments/","check":"pending","checks":"https://patchwork.libcamera.org/api/patches/18325/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"parsemail@patchwork.libcamera.org","Delivered-To":"parsemail@patchwork.libcamera.org","Received":["from lancelot.ideasonboard.com (lancelot.ideasonboard.com\n\t[92.243.16.209])\n\tby patchwork.libcamera.org (Postfix) with ESMTPS id 4A3C0C3261\n\tfor ;\n\tThu, 2 Mar 2023 08:14:01 +0000 (UTC)","from lancelot.ideasonboard.com (localhost [IPv6:::1])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTP id 81E43626C6;\n\tThu, 2 Mar 2023 09:14:00 +0100 (CET)","from mail-pf1-x432.google.com (mail-pf1-x432.google.com\n\t[IPv6:2607:f8b0:4864:20::432])\n\tby lancelot.ideasonboard.com (Postfix) with ESMTPS id 37BD9626C0\n\tfor ;\n\tThu, 2 Mar 2023 09:13:59 +0100 (CET)","by mail-pf1-x432.google.com with SMTP id n5so9554252pfv.11\n\tfor ;\n\tThu, 02 Mar 2023 00:13:59 -0800 (PST)","from chenghaoyang-low.c.googlers.com.com\n\t(112.157.221.35.bc.googleusercontent.com. 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Udma Heap implementation.\n+ */\n+\n+#include \n+\n+namespace libcamera {\n+\n+class UdmaHeap : public Heap\n+{\n+public:\n+\tUdmaHeap();\n+\t~UdmaHeap();\n+\tUniqueFD alloc(const char *name, std::size_t size) override;\n+};\n+\n+} /* namespace libcamera */\ndiff --git a/src/libcamera/heap_allocator.cpp b/src/libcamera/heap_allocator.cpp\nindex 594b1d6a..179c2c21 100644\n--- a/src/libcamera/heap_allocator.cpp\n+++ b/src/libcamera/heap_allocator.cpp\n@@ -18,6 +18,7 @@\n #include \n \n #include \n+#include \n \n namespace libcamera {\n \n@@ -26,6 +27,8 @@ LOG_DEFINE_CATEGORY(HeapAllocator)\n HeapAllocator::HeapAllocator()\n {\n \theap_ = std::make_unique();\n+\tif (!isValid())\n+\t\theap_ = std::make_unique();\n }\n \n HeapAllocator::~HeapAllocator() = default;\ndiff --git a/src/libcamera/meson.build b/src/libcamera/meson.build\nindex ee586c0d..bce26d4b 100644\n--- a/src/libcamera/meson.build\n+++ b/src/libcamera/meson.build\n@@ -45,6 +45,7 @@ libcamera_sources = files([\n 'stream.cpp',\n 'sysfs.cpp',\n 'transform.cpp',\n+ 'udma_heap.cpp',\n 'v4l2_device.cpp',\n 'v4l2_pixelformat.cpp',\n 'v4l2_subdevice.cpp',\ndiff --git a/src/libcamera/udma_heap.cpp b/src/libcamera/udma_heap.cpp\nnew file mode 100644\nindex 00000000..050ab80f\n--- /dev/null\n+++ b/src/libcamera/udma_heap.cpp\n@@ -0,0 +1,117 @@\n+/* SPDX-License-Identifier: LGPL-2.1-or-later */\n+/*\n+ * Copyright (C) 2023, Ideas on Board Oy\n+ *\n+ * dma_heap.h - Dma Heap implementation.\n+ */\n+\n+#include \n+\n+#include \n+#include \n+#include \n+#include \n+#include \n+#include \n+\n+#include \n+\n+#include \n+\n+namespace libcamera {\n+\n+LOG_DEFINE_CATEGORY(UdmaHeap)\n+\n+UdmaHeap::UdmaHeap()\n+{\n+\tint ret = ::open(\"/dev/udmabuf\", O_RDWR, 0);\n+\tif (ret < 0) {\n+\t\tret = errno;\n+\t\tLOG(UdmaHeap, Error)\n+\t\t\t<< \"Failed to open allocator: \" << strerror(ret);\n+\n+\t\tif (ret == EACCES) {\n+\t\t\tLOG(UdmaHeap, Info)\n+\t\t\t\t<< \"Consider making /dev/udmabuf accessible by the video group\";\n+\t\t\tLOG(UdmaHeap, Info)\n+\t\t\t\t<< \"Alternatively, add your user to the kvm group.\";\n+\t\t}\n+\n+\t} else {\n+\t\thandle_ = UniqueFD(ret);\n+\t}\n+}\n+\n+UdmaHeap::~UdmaHeap() = default;\n+\n+UniqueFD UdmaHeap::alloc(const char *name, std::size_t size)\n+{\n+\tif (!isValid()) {\n+\t\tLOG(UdmaHeap, Fatal) << \"Allocation attempted without allocator\" << name;\n+\t\treturn {};\n+\t}\n+\n+\tint ret;\n+\n+\tret = memfd_create(name, MFD_ALLOW_SEALING);\n+\tif (ret < 0) {\n+\t\tret = errno;\n+\t\tLOG(UdmaHeap, Error)\n+\t\t\t<< \"Failed to allocate memfd storage: \"\n+\t\t\t<< strerror(ret);\n+\t\treturn {};\n+\t}\n+\n+\tUniqueFD memfd(ret);\n+\n+\tret = ftruncate(memfd.get(), size);\n+\tif (ret < 0) {\n+\t\tret = errno;\n+\t\tLOG(UdmaHeap, Error)\n+\t\t\t<< \"Failed to set memfd size: \" << strerror(ret);\n+\t\treturn {};\n+\t}\n+\n+\t/* UdmaHeap Buffers *must* have the F_SEAL_SHRINK seal */\n+\tret = fcntl(memfd.get(), F_ADD_SEALS, F_SEAL_SHRINK);\n+\tif (ret < 0) {\n+\t\tret = errno;\n+\t\tLOG(UdmaHeap, Error)\n+\t\t\t<< \"Failed to seal the memfd: \" << strerror(ret);\n+\t\treturn {};\n+\t}\n+\n+\tstruct udmabuf_create create;\n+\n+\tcreate.memfd = memfd.get();\n+\tcreate.flags = UDMABUF_FLAGS_CLOEXEC;\n+\tcreate.offset = 0;\n+\tcreate.size = size;\n+\n+\tret = ::ioctl(handle_.get(), UDMABUF_CREATE, &create);\n+\tif (ret < 0) {\n+\t\tret = errno;\n+\t\tLOG(UdmaHeap, Error)\n+\t\t\t<< \"Failed to allocate \" << size << \" bytes: \"\n+\t\t\t<< strerror(ret);\n+\t\treturn {};\n+\t}\n+\n+\t/* The underlying memfd is kept as as a reference in the kernel */\n+\tUniqueFD uDma(ret);\n+\n+\tif (create.size != size)\n+\t\tLOG(UdmaHeap, Warning)\n+\t\t\t<< \"Allocated \" << create.size << \" bytes instead of \"\n+\t\t\t<< size << \" bytes\";\n+\n+\t/* Fail if not suitable, the allocation will be free'd by UniqueFD */\n+\tif (create.size < size)\n+\t\treturn {};\n+\n+\tLOG(UdmaHeap, Debug) << \"Allocated \" << create.size << \" bytes\";\n+\n+\treturn uDma;\n+}\n+\n+} /* namespace libcamera */\n","prefixes":["libcamera-devel","v3","2/3"]}